Load weighing device for hydraulic loaders



April 21, 1953 G. c REID LOAD WEIGHI IN V EN TORS c. RE/ 49. c

D AMBI ala/965 9054727 *Kamm OEIYEVS April 21, 1953 G. c. REID ET AL 5 3 LOAD WEIGHING DEVICE FOR HYDRAULIC LOADERS Filed Sept. 29, 1950 2 SHEETS-SHEET 2 I N V EN TORS GORGE c. Rl/D 35,77- a. (hu/75:10'

/TTOR/VEVS' Patented Apr. 21, 1953 LOAD WEIGHING DEVICE FOR IiYnRAULI'c v LOADERSV George C. Reid and Robert Chambers, Iander, Wyo,

Applicat'on September 29, 1950,.Seria1Nm 187,63!:

9 Claims. 'l

'Thisinvention appertains to improvements in leading -devices and more 'particularly to means for indicating the quantity of material held in the leading device.

A primary Object of this invention is te provide a weighing device for` a loa-der, the weighing device transmitting the weight of the load held in the Ioader through h-ydraulic means to an indicator, which indicates the quantityof ma.- terial in the leader.

Another important Object of this invention is to provide a weighing device for a hydranliealiy operatedloader, Which is mounted. on a tractor orother powered vehicle,the weighing device' :being -operatively installed. on the forward end of the tractor and supportng the :mns of theboom porti'on of' the leader, thereby supporting the loader and the load held therein and the weighing device 'displacing a qnantity of fiuid, proportionate. to the weight of the boom and the load held :in the hucket at the outer end of the boom, the displaced portion of fluid operating an indicator to register the weight of the load.

These and ancillary Objects .and structura1featuresof merit are attained :by this invention, the

preferred embodiment of which is set .forth in the following description and illustrated in the accompanying drawings, wherein:

Figure 1 is a perspective view of a conventional hydraulically actuated leader, which is mounted on a tractor and which is provided with a weighing device, constructed in accordance with the principles of this invention;

Figure 2 is an enlarged elevatonal view of the weighi-ng device;

.Figure 3 is an enlarged rear'elevational view thereof, and

Figure 4 is a iongitudinal vertical seotionai view taken on line 4-4 of Figure 3.

In the accompanying -drawings, .ta conventional tractor lo is illustrated; the same supporting a hydraulically actuated loader 12 which consists of-a pivotally supported boom .l4 having .arms [6 and l8, which are pivoted at their inner ends to a frame mounted on the tractor frame. A bucket .22 i'scarriedhy the outerendsof the boom arms and 'is hydraulically actuated toscoop up aquantity of' material. In use, the boom is low ered to dispose the hucket in contactwith the material and the bucket is actuated to scoop up a portion of the material, the boom then being raised and the ,tractor 'being driven toa depositing, locale, where the material 'in the bucket is deposited by either Swinging, the bucket' to a dumping position or Opening a discharge: door in the bucket.

drauiie means the weight It is highly desirable', especially, in leading concrete mixers, to accurateiy determine the amount of materiai, since' proportions are critical. In such instances, it is conventionally necessary to weigh the material, *prior to loading of the mixtures by the operation of the scoop or bucket 22 orelse, to weigh the materials after they are discharged from the bucket.

To obviate the defects, attendant With the foregoing systems, and to reduee the time' and labor attendant therewith, a weighing *device 24 is provided, the weighing devicebeing supported by the tractor and being adapted to support the' boom and' leaded hucket and to register by hy thereof.

load may be weighed, while it is being trans ferred by-the bucket to the mixer or other suitablc discharging locaie, depending upon the type of material and the specifie use to which the leader is put.

The leading device 24' includesa mounting plate 26, which is transversely fixedbetween the arms- 28 and 3! oi the frame 29; A-ey1indrical housing -32'ismounted on the supporting bar 26 and inc'ludesa bottom Wall 31 and an upstanding side-waili; The housing is open at the top and -apresilient-closure memher 38 is secured on the upper edges of the side Wall, the closure mefnber being transversely -disposed and closing ott the openupper end of the housing. In this respect,- an annular inwardly directed lateral flange isformed on the upper edge of the annular side Wall of the housing and the fiange is provided' withverticai openings 42 for the recention of fastene'rs u, the iasteners passing through suitable openings tormed in the resiiient member :38 and through openings iormed in aretaining ring dBi Thus, the resilient member 38 isidetachably clampedhetweenthe flange 42 and the ring, li, the member being centrally depressihle. interiorly of the housing to deplace a portion zotthe fluid, such as oil, which normally completely iilis the. housing.. Th displaced fiuid is conveye'd by a fiexihleconduit 48 to an indicattor 50.- which ,is attached ii? a olamp 52 to the frame 29, infront of the'operator's zone;

Means is provided fortransmitting the weight of the load to the resihent member 38 and depressing the res-ilient member in accordance with the weight. The means inciudes a post 54, which vertically-overlies the housing and Which is anchored at its lower end in a collar 56 by means of a looking pin 58. the collar having an enlarged flange filtormed Iaterally onits lower end, the flange 50 engageable insuperimposed rela. ton on the resilient member 38.

Thus, the` A load equalizing member 62 is mounted on the upper end of the post 54 and includes a pair of tubular members 64 and (56 which are spaced apart at their inner confronting ends, the ends being joined in fixed relation by being welded to upstanding triangular plates 53. The upper end of the post extends between the inner ends of the tubular members 65 and 66 and is pivoted by a pivot element ta between the apices of the plates 38. The tubular members are braced by a brace bar 12, which is connected to the' outer ends thereof and extends over the upper end of the post 54. r r

Saddle plates 74 and 16 are carried by the arms Hi and Hi of the boom and are engageable on the outer ends of the tubular members i and 65, to transmit the weight of the boom and the load in the bucket 22 to'the resilient member 2,635,ees

" devices.

38, which is depressed inwardly of the housing,

reactive to the imposition thereon of the load, and which displaces a proportionate quantity of the fiuid in the 'housing through the tubular conduit 48 to the indicator 5%, which indicates the quantity of material in the scoop or bucket 22. An actuating rod 78 is fixed to an ear st which projects rearwardly from the post 54 and is connected to a handle 82, adjacent to the operator.'s zone on the tractor, whereby thepost may be moved forwardly and rearwardly, respecting the housing. In this respect, an arm 843 projects laterally irom the collar 55 and is pivoted by a. pivot member 86 to an upstanding ear 88 formed on a plate St, which is suitably affixed to the housing. A resilient dust cap 92 is circumposed on the collar and overlies the resilient member 38, when the fiange SG is seated on the resilient member, as seen in Fgure l.

A supporting plats s is transversely fixed between the arms 23 and 39, above thehousing, and supports one end of a Spring 96 which is secured to an ear 98 integral with the post and disposed below the ear 80.,

In use, the boom is lowered to bring the bucket 22 into engagement with the material and the bucket is pivoted on the outer ends of the boom arms to scoop up a portion of 'the material. Thus, the bucket is lowered and filled in the conventional manner. Thepost 543 is, meanwhile, swung rearwardly, about the pivot 85, by the actuating member 18, which is operated by the handle 82. 54 is moved forwardly by the actuating member '58, until the saddles lai and '56 are in vertical alignment with the outer ends of the tubes 6 3 and 66. The boom is then lowered, until the saddle plates rest on the outer ends of the tubular mem-j: bers, the post being in substantially perpendicu-` lar relation to the housing. The weight of theboom and the loaded bucket is thus borne entirely V by the resilient member 38 and, the pressure the diaphragm 38 is conveyed by thetubular conduit 48 to the pressure indicator gauge 59. The pressure registered by the indicator gauge is proportionate to the load in thebucketgso that the amount of the load in the bucket is' registered directly and accurately on the indicator dial. 4

When necessary, the operator may actu'ate the conventional hydraulic cylinder for Opening the discharge door in the bottomofthe bucket, to

The boom is lowered and the post` Having thus described this invention, what is claimed is: r

1. In combination with a loader including a vertically swingable bucket supporting boom, a

- weighing device comprising a hydraulic fluid containing chamber having an open upper end, means mounting said chamber on the leader, a diaphragm, means mounting the diaphragm on the open end of the chamber to close ofi said end, a member pivoted to the chamber and disposed substantially perpendicular above the dia-- phragm, an enlarged lower end on said member engageable on the diaphragm to depress the same and displace a portion of the fiuid in the chamber, a conduit connected to the chamber for the passage of the displaced fiuid therethrough, a pressure gauge connected to the conduit for in-;

dicating the amount of fiuid displaced, and a bar member centrally pivoted to the upper end :of

the member for vertical movement about a horizontal axis, the outer ends of the bar member supporting the boom, whereby the weight of the boom and loaded bucket is imposed on the diaphragm t displace a proportionate amount of fluid from the chamber.

2. In combination with a loader vertically swingable bucket supporting boom, a weighing device comprising a hydraulic fiuid containing chamber having an open upper end;

means mounting said chamber on the loader, a diaphragm, means mounting the diaphragm on the open end of the chamber to close off said end, a member pivoted to the ohamber and `disposed substantially perpendioular above the diaphragm, an enlarged lower end on said member engageable on the diaphragm to depress the same and displace a portion of the fiuid in the chamber, a conduit connected to the chamber for the passage of the displaced fiuid there-4 through, a pressure gauge connected t the conduit for indicating the amount of fiuid displaced, and a bar member centrally pivoted to the upper end of the member for vertical movement about a horizontal axis, the outer ends of the bar mem-` ber supporting the boom, whereby the Weight diaphragm adjacent the periphery thereof and fasteners afiixing said ring to the upper edges of the' side walls of the housing.

3. In 'combination with a loader including a vertically swingable bucket supporting boom, a

weighmg device comprising a hydraulic fluid conw taining chamber having an open upper end,

means mounting said chamber on the loader, a

diaphragm, means mounting' the diaphragm on the open end of the chamber to close ofi" said end,

a member pivoted to the chamber and disposed substantially perpendicular above the diaphragm, an. enlarged lower end on said member engageable on the diaphragm to depress the same.

including a' and displace a portion of the fluid'in. the chamber, a conduit connected to the chamber for the passage of the displaced fiuid therethrough, a pressure gauge connected to the conduit for indicating the amount of fiuid displaced, a bar member centrally pivoted to the upper end of the member for vertical movement .about a horizontal axis, the outer ends .of the bar member supporting the boom, whereby the weight of the boom and loaded bucket is imposed on the .diaphragm to displace a proportionate amount .of fiuid from the chamber, and a resilicnt dust cup carried by the member and encompassing the lower end of the member and the diaphragm when the member is perpendicular to the diaphragm with the lower end bearing thereagainst.

4. In combination with a 'leader including a vertically swingable bucket supporting boom, a Weighing device comprising a hydraulic fiuid containing chamber having an open upper end, means mounting said chamber on the loader, a diaphragm, means mounting the diaphragm on the open end of 'the chamber to close ofi said end, a member pivoted to the chamber and disposed substantially perpendicular above the diaphragm, an enlarged lower end on said member engageable on the diaphrgam to depress the same and displace a portion of the fiuid in the chamber, a conduit connected to the chamber for the passage of the displaced fiuid therethrough, a pressure gauge connected to the conduit for indicating the amount of fiuid displaced, a bar member centrally pivoted to the upper end of the member for vertical movement about a horizontal axis, the outer ends of the bar member supporting the boom, whereby the weight of the boom and loaded bucket is imposed on the diaphragm to displace a proportionate amount of fiuid from the chamber, and remote control means for Swinging said member vertically about a horizontal axis.

5. In a weighing device for loaders, the combination of a stationary structure including a leader frame and a hydraulic fiuid chamber, a boom having up and down movement upon the frame, means mounted on the chamber to move downwardly relative thereto and arranged to transmit pressure to and to displace fiuid contained within the chamber when so moved, a gauge associated with the chamber to indicate the quantity of fiuid displaced, a member pivotally connected to said structure for adjustment between first and second positions, said member in its first position being interposed between the boom and said means so as to be engaged by the boom on downward movement of the boom and shifted downwardly with the boom, thus to move the pressure-transmitting means downwardly relative to the chamber and thereby displace fiuid contained within the chamber, said member in its second position being disposed clear of the boom for downward movement of the boom without transmission of movement to the pressure transmitting means, a Spring connected at opposite ends to said structure and member respectively and arranged to normally bias the member to its second position, and means connected to said member and controllable from a location remote from the member to shift the member to the first position thereof against the action of said Spring.

6. In a weighing device for loaders, the combination of a stationary structure including a loader frame and a hydraulc fiuid chamber, a boom having up and down movement upon the framameans mounted on the chamber to movie downwardly relative thereto and arranged to transmit pressure to fiuid contained within the' first and second positions, said member in is first position being disposed in the path of down- Ward movement of the boom and engaging the boom and said means at its upper and lower ends respectively so as to be shifted downwardly with the boom on downward movement of the boom, thus to move the pressure-transmitting means downwardly relative to the chamber and thereby displace fiuid contained within the chamber, said member in its second position being disposed clear of the path of downward movement of the boom to allow said movement of the boom without transmission of movement to the pressure-transmitting means, a spring connected at opposite ends to said structure and member respectively and arranged to normally bias the member to its second position, and means connected to said member and controllable from a location remote from the member to shift the member to the first position thereof against the action of said Spring.

7. In a *weighing device for loaders, the combination of a stationary structure including a loader frame and a hydraulic fiuid chamber, a boom pivotally connected at one end to the frame for vertical Swinging movement, means mounted on the chamber to move downwardly relative thereto and arranged to transmit pressure to fiuid contained within the chamber when so moved, thus to displace said fiuid, a gauge associated with the chamber to indicate the quantity of fiuid displaced, a rigidly constituted, upstanding member pivotally connected to said structure for adjustment between first and second positions, said member in its first position being disposed in the path of downward movement of the boom and engaging said means and an intermediate portion of the boom at its lower and upper ends respectively, so as to be shifted downwardly with the boom on downward movement of the boom, thus to move the pressuretransmitting means downwardly relative to the chamber and thereby displace fluid contained within the chamber, said member in its second position being disposed Clear of the path of downward movement of the boom to allow said movement of the boom without transmission of movement to the pressure-transmitting means, a Spring connected at opposite ends to said structure and member respectively and arranged to normally bias the member to its second position, and means connected to said member and controllable from a location remote from the member to shift the member to the first position thereof against the action of said Spring.

3. In a weighing device for loaders, the combination of a stationary structure including a loader frame and a hydraulic fiuid chamber, a boom having its intermediate portion overlying said chamber and pivotally connected at one end to the frame for vertical Swinging movement, means mounted on the chamber to move downwardly relative thereto and arranged to transmit pressure to fiuid contained within the chamber when so moved, thus to displace said fiuid, a gauge associated with the chamber to indicate the quantity of fiuid displaced, a rigidly constituted; upstanding 'post extending between the boom and saidpressure transmitting means and pivotally connected to said Structure for adjustment between first and second positions, a loadequalizing member pivoted at its center to the upper end of the post, saidmember in the first position of the post being disposed in the path of downward movement of the boom and being engageable at its opposite ends by said boom so as to shift -the post downwardly, the post engaging the pressure-transmitting means at its lower end to move said means downwardly relative to the chamber and there'oy displace fluid contained within the chamber, said member in the second position of the post being disposed clear of the path of downward movement of the boom to allow said movement of the boom without transmission of movement to the pressuretransmitting means, a spring connected at opposite ends to said Structure and post respectiveiy and arranged to normally bias the post to its second position, and means connected to the post and controllable from a location remote from the post to shift the post to the first position thereof against the action of said Spring,

9. In a weighing device for loaders, the combination of a stationary Structure including a loader frame and a hydraulic fluid chamber, a boom having its intermedate portion overlying said chamher and comprising a pair of elongated, spaced arms pivotally connected at one end to the frame for vertical Swinging movement, saddles secured rigidly to and extendng laterally from the respective arms, means mounted on t e chamber to move downwardly relative thereto and arranged to transmit pressure to fluid contained within the chamber when so moved, thus to displace said fluid, a gauge associated with the chamber to indicate the quantity of fluid displaced, .a rigidly constitutd, upstanding post extending between the boom and said pressuretransmitting means and pivotally connected to to 'said Structure for adjustment between first and second positions, a load-equalizing member pivoted at its center to the upper end of the post and extending transversely of said arms, said member in the first position of the post being disposed in the path of downward movement of the boom and being'engaged at its opposite ends by said saddles so as to shift the post downwardly, the post engaging the pressuretransmitting means at its lower end to move said means downwardly relative to the chamber and thereby displace fluid contained within the chamber, said member in the second position of the post being disposed clear of the saddles on downward movement of the boom to allow said movement of the boom without transmission of movement to the pressure-transmitting means,

a Spring connected at opposite ends to said structure and post respectively and arranged to normally bias the post to its second position, and means connected to the post and controllable from a location remote from the post to shift the post to the first position thereof against the action of said Spring.

GEORGE C. REID. ROBERT B. CHAMBERS.

Beferences Cited in the file of this patent UNITED STATES PATENTS v Number Name Date 454,249 r Bache June 16, 1891 2,349,228 Wolff May 16,1944 2,520,033 Fuelling Aug. 22, 1950 2,551,l78 Southerland May 1, 1951 

